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Electrochemical reduction of CO2 to formate at high current density using gas diffusion electrodes

Kopljar, Dennis and Inan, Andrea and Vindayer, P. and Wagner, Norbert and Klemm, Elias (2014) Electrochemical reduction of CO2 to formate at high current density using gas diffusion electrodes. Journal of Applied Electrochemistry, pp. 1107-1116. Springer. DOI: DOI 10.1007/s10800-014-0731-x ISSN 0021-891X

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Abstract

The electrochemical reduction of carbon dioxide into formate was studied using gas diffusion electrodes (GDE) with Sn as electrocatalyst in order to overcome mass transport limitations and to achieve high current densities. For this purpose, a dry pressing method was developed for GDE preparation and optimized with respect to mechanical stability and the performance in the reduction of CO2. Using this approach, GDEs can be obtained with a high reproducibility in a very simple, fast, and straightforward manner. The influence of the metal loading on current density and product distribution was investigated. Furthermore, the effect of changing the electrolyte pH was evaluated. Under optimized conditions, the GDE allowed current densities up to 200 mA cm-2 to be achieved with a Faradaic efficiency of around 90 % toward formate and a substantial suppression of hydrogen production (<3 %) at ambient pressure. At higher current densities mass transport issues come into effect and hydrogen is increasingly produced. The corresponding cathode potential was found to be 1.57 V vs. SHE.

Item URL in elib:https://elib.dlr.de/91056/
Document Type:Article
Title:Electrochemical reduction of CO2 to formate at high current density using gas diffusion electrodes
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kopljar, DennisUni StuttgartUNSPECIFIED
Inan, Andreaandrea.inan (at) itc.uni-stuttgart.deUNSPECIFIED
Vindayer, P.Uni StuttgartUNSPECIFIED
Wagner, Norbertnorbert.wagner (at) dlr.deUNSPECIFIED
Klemm, Eliaselias.klemm (at) itc.uni-stuttgart.deUNSPECIFIED
Date:24 August 2014
Journal or Publication Title:Journal of Applied Electrochemistry
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :DOI 10.1007/s10800-014-0731-x
Page Range:pp. 1107-1116
Publisher:Springer
ISSN:0021-891X
Status:Published
Keywords:Gasdiffusionselektrode Kohlendioxidreduktion Formiatherstellung
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion and Use (old)
HGF - Program Themes:Fuel Cells (old)
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Wagner, Dr.rer.nat. Norbert
Deposited On:22 Oct 2014 09:46
Last Modified:22 Oct 2014 09:46

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